Camera.h revision bfa33aae4f54c0020a0568b16a3acb7b30b6ca3d
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_HARDWARE_CAMERA_H 18#define ANDROID_HARDWARE_CAMERA_H 19 20#include <utils/Timers.h> 21#include <camera/ICameraClient.h> 22#include <gui/ISurfaceTexture.h> 23 24namespace android { 25 26/* 27 * A set of bit masks for specifying how the received preview frames are 28 * handled before the previewCallback() call. 29 * 30 * The least significant 3 bits of an "int" value are used for this purpose: 31 * 32 * ..... 0 0 0 33 * ^ ^ ^ 34 * | | |---------> determine whether the callback is enabled or not 35 * | |-----------> determine whether the callback is one-shot or not 36 * |-------------> determine whether the frame is copied out or not 37 * 38 * WARNING: 39 * When a frame is sent directly without copying, it is the frame receiver's 40 * responsiblity to make sure that the frame data won't get corrupted by 41 * subsequent preview frames filled by the camera. This flag is recommended 42 * only when copying out data brings significant performance price and the 43 * handling/processing of the received frame data is always faster than 44 * the preview frame rate so that data corruption won't occur. 45 * 46 * For instance, 47 * 1. 0x00 disables the callback. In this case, copy out and one shot bits 48 * are ignored. 49 * 2. 0x01 enables a callback without copying out the received frames. A 50 * typical use case is the Camcorder application to avoid making costly 51 * frame copies. 52 * 3. 0x05 is enabling a callback with frame copied out repeatedly. A typical 53 * use case is the Camera application. 54 * 4. 0x07 is enabling a callback with frame copied out only once. A typical use 55 * case is the Barcode scanner application. 56 */ 57#define FRAME_CALLBACK_FLAG_ENABLE_MASK 0x01 58#define FRAME_CALLBACK_FLAG_ONE_SHOT_MASK 0x02 59#define FRAME_CALLBACK_FLAG_COPY_OUT_MASK 0x04 60 61// Typical use cases 62#define FRAME_CALLBACK_FLAG_NOOP 0x00 63#define FRAME_CALLBACK_FLAG_CAMCORDER 0x01 64#define FRAME_CALLBACK_FLAG_CAMERA 0x05 65#define FRAME_CALLBACK_FLAG_BARCODE_SCANNER 0x07 66 67// msgType in notifyCallback and dataCallback functions 68enum { 69 CAMERA_MSG_ERROR = 0x001, 70 CAMERA_MSG_SHUTTER = 0x002, 71 CAMERA_MSG_FOCUS = 0x004, 72 CAMERA_MSG_ZOOM = 0x008, 73 CAMERA_MSG_PREVIEW_FRAME = 0x010, 74 CAMERA_MSG_VIDEO_FRAME = 0x020, 75 CAMERA_MSG_POSTVIEW_FRAME = 0x040, 76 CAMERA_MSG_RAW_IMAGE = 0x080, 77 CAMERA_MSG_COMPRESSED_IMAGE = 0x100, 78 CAMERA_MSG_ALL_MSGS = 0x1FF 79}; 80 81// cmdType in sendCommand functions 82enum { 83 CAMERA_CMD_START_SMOOTH_ZOOM = 1, 84 CAMERA_CMD_STOP_SMOOTH_ZOOM = 2, 85 // Set the clockwise rotation of preview display (setPreviewDisplay) in 86 // degrees. This affects the preview frames and the picture displayed after 87 // snapshot. This method is useful for portrait mode applications. Note that 88 // preview display of front-facing cameras is flipped horizontally before 89 // the rotation, that is, the image is reflected along the central vertical 90 // axis of the camera sensor. So the users can see themselves as looking 91 // into a mirror. 92 // 93 // This does not affect the order of byte array of CAMERA_MSG_PREVIEW_FRAME, 94 // CAMERA_MSG_VIDEO_FRAME, CAMERA_MSG_POSTVIEW_FRAME, CAMERA_MSG_RAW_IMAGE, 95 // or CAMERA_MSG_COMPRESSED_IMAGE. This is not allowed to be set during 96 // preview. 97 CAMERA_CMD_SET_DISPLAY_ORIENTATION = 3, 98 99 // cmdType to disable/enable shutter sound. 100 // In sendCommand passing arg1 = 0 will disable, 101 // while passing arg1 = 1 will enable the shutter sound. 102 CAMERA_CMD_ENABLE_SHUTTER_SOUND = 4, 103 104 // cmdType to play recording sound. 105 CAMERA_CMD_PLAY_RECORDING_SOUND = 5, 106}; 107 108// camera fatal errors 109enum { 110 CAMERA_ERROR_UNKNOWN = 1, 111 CAMERA_ERROR_SERVER_DIED = 100 112}; 113 114enum { 115 CAMERA_FACING_BACK = 0, /* The facing of the camera is opposite to that of the screen. */ 116 CAMERA_FACING_FRONT = 1 /* The facing of the camera is the same as that of the screen. */ 117}; 118 119struct CameraInfo { 120 121 /** 122 * The direction that the camera faces to. It should be 123 * CAMERA_FACING_BACK or CAMERA_FACING_FRONT. 124 */ 125 int facing; 126 127 /** 128 * The orientation of the camera image. The value is the angle that the 129 * camera image needs to be rotated clockwise so it shows correctly on 130 * the display in its natural orientation. It should be 0, 90, 180, or 270. 131 * 132 * For example, suppose a device has a naturally tall screen. The 133 * back-facing camera sensor is mounted in landscape. You are looking at 134 * the screen. If the top side of the camera sensor is aligned with the 135 * right edge of the screen in natural orientation, the value should be 136 * 90. If the top side of a front-facing camera sensor is aligned with 137 * the right of the screen, the value should be 270. 138 */ 139 int orientation; 140}; 141 142class ICameraService; 143class ICamera; 144class Surface; 145class Mutex; 146class String8; 147 148// ref-counted object for callbacks 149class CameraListener: virtual public RefBase 150{ 151public: 152 virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2) = 0; 153 virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr) = 0; 154 virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) = 0; 155}; 156 157class Camera : public BnCameraClient, public IBinder::DeathRecipient 158{ 159public: 160 // construct a camera client from an existing remote 161 static sp<Camera> create(const sp<ICamera>& camera); 162 static int32_t getNumberOfCameras(); 163 static status_t getCameraInfo(int cameraId, 164 struct CameraInfo* cameraInfo); 165 static sp<Camera> connect(int cameraId); 166 ~Camera(); 167 void init(); 168 169 status_t reconnect(); 170 void disconnect(); 171 status_t lock(); 172 status_t unlock(); 173 174 status_t getStatus() { return mStatus; } 175 176 // pass the buffered Surface to the camera service 177 status_t setPreviewDisplay(const sp<Surface>& surface); 178 179 // pass the buffered ISurfaceTexture to the camera service 180 status_t setPreviewTexture(const sp<ISurfaceTexture>& surfaceTexture); 181 182 // start preview mode, must call setPreviewDisplay first 183 status_t startPreview(); 184 185 // stop preview mode 186 void stopPreview(); 187 188 // get preview state 189 bool previewEnabled(); 190 191 // start recording mode, must call setPreviewDisplay first 192 status_t startRecording(); 193 194 // stop recording mode 195 void stopRecording(); 196 197 // get recording state 198 bool recordingEnabled(); 199 200 // release a recording frame 201 void releaseRecordingFrame(const sp<IMemory>& mem); 202 203 // autoFocus - status returned from callback 204 status_t autoFocus(); 205 206 // cancel auto focus 207 status_t cancelAutoFocus(); 208 209 // take a picture - picture returned from callback 210 status_t takePicture(); 211 212 // set preview/capture parameters - key/value pairs 213 status_t setParameters(const String8& params); 214 215 // get preview/capture parameters - key/value pairs 216 String8 getParameters() const; 217 218 // send command to camera driver 219 status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2); 220 221 // return the total number of available video buffers. 222 int32_t getNumberOfVideoBuffers() const; 223 224 // return the individual video buffer corresponding to the given index. 225 sp<IMemory> getVideoBuffer(int32_t index) const; 226 227 // tell camera hal to store meta data or real YUV in video buffers. 228 status_t storeMetaDataInBuffers(bool enabled); 229 230 void setListener(const sp<CameraListener>& listener); 231 void setPreviewCallbackFlags(int preview_callback_flag); 232 233 // ICameraClient interface 234 virtual void notifyCallback(int32_t msgType, int32_t ext, int32_t ext2); 235 virtual void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr); 236 virtual void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); 237 238 sp<ICamera> remote(); 239 240private: 241 Camera(); 242 Camera(const Camera&); 243 Camera& operator=(const Camera); 244 virtual void binderDied(const wp<IBinder>& who); 245 246 class DeathNotifier: public IBinder::DeathRecipient 247 { 248 public: 249 DeathNotifier() { 250 } 251 252 virtual void binderDied(const wp<IBinder>& who); 253 }; 254 255 static sp<DeathNotifier> mDeathNotifier; 256 257 // helper function to obtain camera service handle 258 static const sp<ICameraService>& getCameraService(); 259 260 sp<ICamera> mCamera; 261 status_t mStatus; 262 263 sp<CameraListener> mListener; 264 265 friend class DeathNotifier; 266 267 static Mutex mLock; 268 static sp<ICameraService> mCameraService; 269 270}; 271 272}; // namespace android 273 274#endif 275